SB2026072190 - NULL pointer dereference in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-64207)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in qfq_dequeue() and qfq_peek_skb() when processing GSO packets through DualPI2 with QFQ as the parent qdisc. A local user can trigger GSO packet segmentation and packet dequeue operations to cause a denial of service.

Exploitation requires DualPI2 to split a GSO skb and QFQ to be configured as the parent qdisc.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/05ed733b65ab977dd931e7f7ac0f62fdb81205c2
• https://git.kernel.org/stable/c/806586e33891066487db1f002be3d455cda6b516
• https://git.kernel.org/stable/c/c4b70c1512b8f9f33f23c2c8196dfd1210207681